<template>
<!-- 频道管理 弹出层 -->
  <div>
    <!-- 弹出层的头部区域 -->
    <van-nav-bar title="频道管理">
      <template #right>
        <van-icon name="cross" size="0.37333334rem" color="white" @click="closePopupFn"/>
      </template>
    </van-nav-bar>
    <!-- 我的频道 -->
    <div class="my-channel-box">
      <div class="channel-title">
        <span>我的频道
          <span class="small-title">
            点击{{isShowCross?'删除':'进入'}}频道
          </span>
        </span>
        <span  @click="editFn">{{isShowCross?'完成':'编辑'}}</span>
      </div>
      <!-- 我的频道列表 -->
      <van-row type="flex">
        <van-col span="6" v-for="obj in userChannelList" :key="obj.id" @click="enterFn(obj.id)">
          <div class="channel-item van-hairline--surround">
            {{obj.name}}
            <!-- 删除的徽标 -->
            <!-- van-badge组件内没有实现点击事件 也没有$emit回触发我的click事件方法   click.native 修饰符: vue组件内给原生的根标签 绑定原生点击事件 -->
            <van-badge color="transparent" class="cross-badge" v-show='isShowCross && obj.id!=0' @click.native.stop="delFn(obj.id)">
              <template #content>
                <van-icon
                  name="cross"
                  class="badge-icon"
                  color="#cfcfcf"
                  size="0.32rem"

                />
              </template>
            </van-badge>
          </div>
        </van-col>
      </van-row>
    </div>

    <!-- 更多频道 -->
    <div class="more-channel-box">
      <div class="channel-title">
        <span>点击添加更多频道：</span>
      </div>
      <!-- 更多频道列表 -->
      <van-row type="flex">
        <van-col span="6" v-for="obj in unCheckChannelList" :key="obj.id" >
          <div class="channel-item van-hairline--surround" @click="addChannelFn(obj)">{{obj.name}}</div>
        </van-col>
      </van-row>
    </div>
  </div>
</template>

<script>
import { getChannelListAPI } from '@/api'
export default {
  props: {
    userChannelList: Array // 用户已选数组
  },
  data () {
    return {
      allChannelList: [], // 所有频道
      isShowCross: false // 频道的 x 是否显示
    }
  },
  async created () {
    try {
      const res = await getChannelListAPI()
      // console.log(res.data)
      this.allChannelList = res.data.data.channels
    } catch (error) {
      console.log(error)
    }
  },
  computed: {
    // 未选择的频道列表
    unCheckChannelList () {
      return this.allChannelList.filter(obj => {
        const idx = this.userChannelList.findIndex(checkedObj => checkedObj.id === obj.id)
        if (idx > -1) {
          // 用户已选过这个频道
          return false
        } else {
          return true
        }
      })
    }
  },
  methods: {
    // 进入频道
    enterFn (channelId) {
      if (this.isShowCross === false) {
        this.$emit('closePopupEvent', false) // 关闭弹出层
        this.$emit('input', channelId) // input事件 组件里用v-model
      }
    },
    // 删除已选频道
    delFn (channelId) {
      if (this.isShowCross === true && channelId !== 0) {
        this.$emit('removeChannelEvent', channelId)
      }
    },
    // 新增频道
    addChannelFn (obj) {
      if (this.isShowCross === true) {
        // 点击编辑时
        this.$emit('addChannelEvent', obj)
      }
    },
    // 关闭弹出层
    closePopupFn () {
      this.$emit('closePopupEvent', false)
      this.isShowCross = false // 隐藏 x 徽标
    },
    editFn () {
      this.isShowCross = !this.isShowCross
    }
  }
}
</script>

<style scoped lang="less">
.van-popup,
.popup-container {
  background-color: transparent;
  height: 100%;
  width: 100%;
}

.popup-container {
  display: flex;
  flex-direction: column;
}

.pop-header {
  height: 90px;
  background-color: #007bff;
  color: white;
  text-align: center;
  font-size: 14px;
  position: relative;
  .title {
    width: 100%;
    position: absolute;
    bottom: 15px;
  }
}

.pop-body {
  flex: 1;
  overflow: scroll;
  padding: 8px;
  background-color: white;
}

.my-channel-box,
.more-channel-box {
  .channel-title {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
    line-height: 28px;
    padding: 0 6px;
  }
}

.channel-item {
  font-size: 12px;
  text-align: center;
  line-height: 36px;
  background-color: #fafafa;
  margin: 5px;
}

/*删除的微标 */
.cross-badge {
  position: absolute;
  right: -3px;
  top: 0;
  border: none;
}

/*提示文字 */
.small-title {
  font-size: 10px;
  color: gray;
}
</style>
